i run avid's revolutions in my 8t and the price works out to about $1 each. i run them as they come for 1 race and then when i tear the truck down to clean it, i clean them out and re-oil them. i can get 3-4 cleanings out of them. if i oil them and can not get a "smooth" feel, they get pitched and i throw in a new one.

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consistency will get you better results than speed, but if you have both-look out!!
thanks to Tony Bacon, Dialed-rc hobbies, BoomRC